Typewriting machine



A ril 17, 1934. c. w. CRUMRINE TYPEWRITING MACHINE 2 Sheets-Sheet 1Filed Sept. 50, 1951 INVENTOR CHE STER l/V. (RU/4H ATTORNEY PatentedApr. 17, 1934 NITED STATES PATENT OFFICE TYPEWRITING MACHINE ApplicationSeptember 30, 1931, Serial No. 565,998

4 Claims.

This invention relates to improvements in typewriting machines, andparticularly to the paper feeding devices of such machines, and theprincipal object of the invention is the provision of simple,inexpensive and efficient means for feeding small work sheets, such ascards or narrow strips, past the printing line on the platen whilemoving all parts of the work sheet in parallel paths substantiallyperpendicular to said printing line on the platen.

Another object of the invention is the provision of a type guide andribbon guide spaced from the front of the platen, and paper feedingdevices comprising an apron and feed rolls arranged below the printingline and releasable from the front of the platen so that a card or otherwork sheet can be conveniently inserted from the front of the platenbetween it and the paper feed devices, means being also provided forretaining the means for releasing said rolls and apron in releasingposition, a greater extent of movement being provided for the ribbonvibrator so that it moves out of the path of -a sheet being insertedfrom the front.

To these and other ends, the invention consists in the construction andarrangement of parts that will appear from the following descriptionwhen read in conjunction with the accompanying drawings, the novelfeatures being pointed out in the claims at the end of thespecification.

In the drawings: Fig. 1 is a fragmentary transverse section of so muchof a typewriting machine as is necessary to illustrate one possibleembodiment of the invention;

Fig. 2 is an inverted plan view of the paper feeding devices; 7 I

' Fig. 3 is a fragmentary transverse sectional view of devices shown inFig. 1, but showing the front paper feed rolls released from the platen,

and

Fig. 4 is a fragmentary end elevation of the carriage.

Referring particularly to the drawings, the invention is illustratedapplied to a power operated typewriting machine of well known type andcomprising a revoluble platen 1 mounted in the frame of a carriage'2which is mounted fonmovement transversely of the frame 3 of the machineon antifriction bearings 4 arranged in guideways provided therefor inthecarriage and frame of the machine.

Type bars 5 are pivoted in a .ype basket 6 in the frame of the machineand are provided with types 7 adjacent their free ends adapted to engagethe platen or the Work sheet thereon when the type bars are swung ontheir pivots. Power driven devices are provided for operating the typebars or other printing instrumentalities of the machine. form of hellcrank levers 8 pivoted on a common pivot rod 9 and having one armconnected with an arm of a bell crank lever 11 by means of the link 12.The bell crank lever 11 is pivoted on the common pivot rod 13 and itsother arm 14 is connected with the free end of a toggle lever 15 bymeans of a link 16 The lever 15 is pivoted to the arm 16 of the typebar, and at its other end is pivotally connected with the free end of atoggle link 17 pivoted on a fixed part of the frame. A spring 18connects the arm 14 of the bell crank with a fixed part of the frame andresiliently maintains the parts in the normal position shown in Fig. 1of the drawings, in which the type bar is retracted and the toggle 15,17 in straightened position. When the actuator lever 8 is swung to pullthe link 12, it operates to swing the lever 15 in a direction to breakthe toggle and swing the type bar into printing engagement with theplaten.

. The bell crank 8 has an arm 19 projecting downwardly, on the free endof which a cam 21 is revolubly mounted adjacent the surface of a powerdriven roller 22. A spring-pressed arm 23 engages a lug 24 on the camand tends to swing 35 it on its pivot into engagement with the roller ora projection 20 thereon into engagement with a stop 25 on a detent lever26 pivoted on the bell crank 8. At its upper end, the lever 26 has alateral projection whereby itis engaged by the slotted end of an arm 27projecting downwardly from a key lever 28. The key lever is pivoted onthe common pivot rod 13 and has a key 29 whereby it may be manuallyoperated. A spring 31 connects the key lever with a fixed part andresiliently maintains the key lever and parts connected therewith in:the normal position shown in Fig. 1. When the key is depressed, itswings the detent lever to move its stop 25 out of the pathof theprojection 20 and permits the cam to turn under the action of the arm 23into engagement with the roller. The cam is then rotated by the rollerand swings the lever 8 to swing the bell crank 11, which swings the typebar into engagement with the platen. The parts thus far described are ormay be of usual construction and form no part of the present inventionexcept as they enter into combination therewith.

A type guide 32 projects upwardly and rear- Said devices compriseactuators in the mounted in the frame.

wardly from the type basket to a point adjacent the printing point onthe platen. A ribbon vibrator 33 is slidably mounted on the type guideto move to and from a point to interpose the ribbon over the printingpoint on the platen in a well known manner. The ribbon vibrator isautomatically operated by the devices which operate the type bars andhas a downwardly projecting arm 34 whereby it is pivotally mounted onthefree end of an arm 35-pivotally mounted on a fixed part of the frame. Astop 36 projects upwardly from the frame of the machine into the path ofthe arm 35 and limits its movement in a downward direction. A link 37 ispivoted to the arm 35 and connects it with a stud 38 arranged in athree-armed slot in an actuator 39 pivoted on a fixed part of the frame.The actuator 39 is operatively connected with a universal bar 41 bymeans of a link 42 which is pivotally connected to an arm 43 projectingrearwardly from the bar 41 and having a downwardly projecting arm 44which is connected with a fixed part by means of a spring 45. Theuniversal bar is pivoted on a fixed part and resiliently engages arms 46on the bell cranks 11 under the action of the spring 45. When one of thebell crank levers 11 is actuated to operate a type bar, it swings theuniversal bar against the tension of the spring 45 to swing the actuator39, and through the link 37 moves the ribbon vibrator to. the printingpoint.

The stud 38 is manually adjustable in its slot to vary the extent ofmovement imparted to the vibrator to move different parts of a bichromeribbon to the printing point or to. silence the.rib-' bon vibrator whenstenciling operations are being performed. To this end, a link 48 iscon-- nected with the stud 38 at one end, and at itsother end is pivotedto an arm 49 fixed on a rock shaft 51 which is revolubly mounted in theframe. A second arm 52 is fixed on the rock shaft and pivotallyconnected with a push rod 53 slidably At its forward end, the push rodhas a button 54 secured thereto by which it may be manually operated. Adetent 55 is fixed on the frame and resiliently engages one or anotherof a plurality of projections 56 on the 'rod for resiliently retainingit in adjusted position. Assuming that the parts are adjusted for movingthe vibratorto print from the black portion of the ribbon, as shown inFig. 1, a pull on the rod 53 adjusts the stud 38 farther from the axialcenter of the actuator so that greater extent of movement is imparted tothe vibrator to move the lower or red portion of the ribbon to theprinting point. If, however, the rod 53 is pushed inwardly from theposition shown in Fig. 1,the stud is moved into the curved portion ofthe slot in the actuator, and movement of the actuator is not impartedto the vibrator as when performing stencilling operations. It will benoted that the type guide and ribbon vibrator are spaced at somedistance from the front of the platen and below the printing pointthereon to provide a wide clearance for a work sheet or a plurality ofwork sheets with carbons arranged between them to be inserted at thefront of the platen. In the Paper feeding devices are provided whichdooperate with the bottom and front side of the platen and are manuallymovable from the front of the platen to receive the work sheet. Saidpaper feeding devices comprise a frame having curved end members 61 and62 which are secured intermediate their front and rear ends to theopposite ends of a rod 63 extending longitudinally of the platen andarranged beneath the same. The rod 63 is seated in a slot providedtherefor in an arm 64 projecting rearwardly from a rock shaft 65 mountedin the carriage frame at a point substantially midway between the endsof the platen and engages the rod 63 at a, point substantially midwaybetween the end members 61 and 62. At one end, the left hand end asshown in the drawings, the rock shaft 65 projects through the end member66 of the carriage in which it has a bearing, and at its outer end hasan arm 67 secured thereto. The arm 64 and feed roll frame are held inoperative position as in Fig. 1 by means of spring 80 secured at one endto the rock shaft 65 and at its other end to the'end member 66 of thecarriage. The arm 67 is pivotally connected with the end of a piece 69.Intermediate its ends, the lever 68 is pivotally connected with a link'71 pivotally mounted on the end member 66 of the carriage frame.

Revolubly mounted on the arms 61 and 62 adjacent their rear ends andextending between them is a rear feed roller 72. The feed roller 72preferably comprises a plurality of relatively short sections, as shown,which are adapted to project through openings in a paper apron 73 intoengagement with the platen. The feed roller is mounted on a shaft -'74which turns on cone bearings 75 adjustably mounted on the end members 61and 62 and projecting inwardly therefrom. A front feed roller 76 alsocomprises a plurality of sections adapted to engage the platen throughopenings in the apron 73, which are mounted on a shaft 77 which isrevolubly mounted on cone bearings on the end members 61 and 62 in amanner similar to the rear feed roll shaft 74. The paper apron 73 isfixedly secured to the upper sides of the end members 61 and 62, so asto be arranged between said members and the surface of the platen andextends upwardly at the front of the platen and terminates at a pointbelow the printing point. A spring '78 is coiled about the rod 63 andhas .hand lever 68 which is providedwith a finger one end anchored onthe arm 64 and at its other end engages the paper apron and tends topress the paper apron and with it the feed rolls into engagement withthe platen, as seen in Fig. 1. It will be noted that by thisarrangement, the frame in which the paper feeding devices are mounted issupported by a single means at a point adjacent its center, that is,substantially midway between its ends and sides so that'either end orside may yield against the tension of the spring away from the platenunder the influence of the work sheet engaged thereby while other partsmay engage the platen. The spring engages the frame at a pointsubstantially intermediate the rod 63 and the shaft for the rear feedrolls so that when the arm 64 is moved away from the platen, thusreleasing the pressure on the rod, the front part of the frame with thefront feed rolls swings away from the platen to the position shown inFig. 3 about the axis of the rear feed rolls as a center, which areretained in contact with the platen under the tension of the spring.

When a sheet is to be inserted on the platen, the lever 68 is swungforwardly to swing the arm 67 downwardly and with it the arm 64 torelease the front feed rolls and permit them and the front of the paperapron to swing away from the platen to the position shown in Fig. 3, inwhich one or a plurality of superimposed work sheets may readily beinserted from behind the type guide and ribbon vibrator between them andthe platen. During such forward movement of the finger piece, the arm 71swings forwardly until the pivotal points of the lever 68 reach aposition alined with its axis, in which position they are retained andlock, the front feed rolls in a position released from the platen. Thusit will be noted that the arm 71 cooperates with the lever 68 to form ineffect a toggle which moves to the straight position when the rock shaftis actuated to release the front feed rolls from the platen and servesto retain said rolls in released position. When the lever 68 is againactuated, it breaks the toggle and permits the feed rolls to reengagethe platen. A stop 79 fixed in the carriage end member 66 may bearranged in the path of the lever 68 to limit its movement in onedirection.

It will be noted that the devices herein described provide simple andconvenient means for feeding short work sheets, such as cards orinvoices, which may be inserted at the front of the platen betweenlthefront feed rolls and the platen and which are then fed forwardly insubstantially straight lines past the printing point.

Although only one embodiment of the invention is shown and describedherein, it will be understood that this application is intended to coversuch changes or modifications as come within the spirit of the inventionor scope of the following claims.

I claim:

1. In a typewriting machine'having a frame and a carriage thereon, thecombination of a platen revolubly mounted in the carriage, a rigid rodextending longitudinally of the carriage beneath the platen, a pair ofoppositely projecting arms on each end of said rod, a paper apronconnecting and mounted on 'said arms and arranged adjacent the bottomand front sides of the platen, a single pivoted arm on which said rod ismounted, resilient means cooperating with said arm and engaging saidapron at a point in rear of the rod for pressing the apron toward theplaten, and means for swinging said arm to release the front side of thepaper apron to permit it to swing away from the platen while its rearportion is resiliently pressed toward the platen.

2. In a typewriting machine having a frame and a carriage thereon, thecombination of a platen revolubly mounted in the carriage, a frameextending longitudinally of the carriage beneath the platen andcomprising a rigid rod, front and rear feed rolls revolubly mounted insaid frame, an arm in which said rod is loosely seated, resilient meanscooperating with said arm and engaging said frame for pressing the frametoward the platen to engage the feed rolls therewith, and manuallyoperated means for swinging said arm to release the'pressure of saidresilient means from the front of the frame to permit the frame to swingto move the front feed rolls from the platen while maintaining the rearfeed rolls in engagement therewith.

3 In a typewriting machine having a frame anda carriage thereon, thecombination of a platen revolubly mounted in the carriage, a rigid rodextending longitudinally of the carriage beneath the platen,transversely arranged arms on the ends of said rod and rigidly connectedtherewith, front and rear feed rolls revolubly mounted in said arms, apaper apron connecting said arms and secured thereto and provided with100 openings through which the feed rolls project into engagement withthe platen, an arm on which said rod is loosely seated, resilient meanscooperating with said arm and engaging the paper apron to press the feedrolls into engagement with the platen, and manually operated means forswinging said arm to release the pressure of said resilient means fromthe front of the apron to permit said arms to swing about the axis ofthe rear feed rolls to move the front feed rolls from engagement withthe platen.

ings through which the feed rolls engage the platen, a rock shaft on thecarriage, an arm fixed to the rock shaft in which said rod is looselyseated, said rod being engaged by the arm at a point substantiallyequidistant from said first mentioned arms and between the same,resilient means engaging said apron and cooperating with said arm forresiliently pressing the feed rolls into engagement with the platen, andmanually operated means for turning said rock shaft to swing the armaway from the platen to release 3 the pressure on the frontfeed rolls topermit them to move away from the platen.

CHESTER W. CRUMRINE.

